# Chapter 10 - Radical Expressions and Equations - 10-4 Solving Radical Equations - Practice and Problem-Solving Exercises - Page 637: 29

$x=-7$ is extraneous

#### Work Step by Step

$x=\sqrt 28-3x$ With $x=4$ then $4=\sqrt 28-3(4)$ $4=4$ With $x=-7$ then $-7=\sqrt 28-3(-7)$ $-7\ne7$ Hence, $x=-7$ is extraneous.

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